Realm of Inferno hell (part-2)
Forums have all sorts of information and he doesn't want to keep depending on Aster, ordering him to check this and that. The latter already have much on the plate. So, it seemed like a good option at that moment.
He first found the list containing 3 top-ranking demons posted by the developers as a note when the update details are released.
Before the update, with each of them in level 500, King Baal and King Belial, who used to be rivals fighting for the land, but due to the emergence of the third king, Paimon (Quest done by some demon race player), an agreement established between them and they merged the two kingdoms to create the Demon Kingdom of the present.
Right now, just like the three wild zones, the Demon Kingdom is ruled by three demon kings with no one superior to the other.